ACH550 User’s Manual
43
Pump Alternation
This macro configures for pump alternation applications, usually used in booster
stations. To adjust/maintain pressure in the network, the speed of the one pump
changes according to a signal received from a pressure transducer. When the
variable speed pump reaches a maximum speed limit, auxiliary pumps start as
needed. When using process PID, see "General Considerations" on page 35. To use
more than one (the default) Auxiliary pump, see parameter group 81.
Parameters Changed Relative to HVAC Default
Parameter
Value
Parameter
Value
9902
APPLIC
MACRO
7 (
PUMPALTERN
)
1609
START
ENABLE
2
5 (
DI
5)
1105
REF
1
MAX
62Hz/1860rpm
2208
EM
DEC
TIME
62
HZ
1201
CONST
SPEED
SEL
0 (
NOT
SEL
)
2202
ACCELER
TIME
1
5.0 s
1401
RELAY
OUTPUT
1
31 (
PFA
)
2203
DECELER
TIME
1
5.0 s
1503
AO
1
CONTENT
MAX
62
HZ
3207
SUPERV
3
PARAM
0103 (
OUTPUT
FREQ
)
1508
AO
2
CONTENT
MIN
0.0%
4101
GAIN
1.0
1509
AO
2
CONTENT
MAX
100.0%
4102
INTEGRATION
TIME
60.0 s
1601
RUN
ENABLE
2 (
DI
2)
8123
PFA
ENABLE
1 (
ACTIVE
)
1608
START
ENABLE
1
0 (
NOT
SEL
)
1
SCR
2
AI1
3
AGND
4
10V
5
AI2
6
AGND
7
AO1
8
AO2
9
AGND
10 24V
11 GND
12 DCOM1
13 DI1
14 DI2
15 DI3
16 DI4
17 DI5
18 DI6
19 RO1C
20 RO1A
21 RO1B
22 RO2C
23 RO2A
24 RO2B
25 RO3C
26 RO3A
27 RO3B
X1
+
mA
mA
External reference
0(2)…10 V or 0(4)…20 mA
Reference voltage 10 VDC
Output frequency:
0(4)…20 mA
Start/Stop:
Activate to start drive
Run permissive:
Deactivate to stop drive (P 1601)
Not configured
PFA interlock 1:
Deactivate to stop drive (P 1608)
PFA interlock 2:
Deactivate to stop drive (P 1609)
Relay output 1 (P 1401)
Default operation:
PFA
(starts lag pump)
Relay output 2 (P 1402)
Default operation:
Running
=>22 connected to 24
Relay output 3 (P 1403)
Default operation:
Fault (-1)
=>25 connected to 27
Output current:
0(4)…20 mA
Not configured
Analog input circuit common
PID feedback:
0(2)…10 V or 0(4)…20 mA
Analog output circuit common
Auxiliary voltage 24 VDC
Common for DI return signals.
Digital input common for all
Signal cable shield (screen)
Analog input circuit common
(Fault => 25 connected to 26)
J1
AI1: 0(2)
…
10 V
AI2: 0(4)
…
20 mA
ON
ON
Jumper Settings
+